Alternative titles and symbols : Hypertryptophanemia, familial;
Inheritance : Autosomal recessive;
Molecular basis : Caused by mutation in the tryptophan 2,3-dioxygenase gene (TDO2, 191070.0001);
Laboratory abnormalities : Normal to high urinary 5-hydroxyindoleacetic acid (5-HIAA) levels; Normal plasma melatonin level; Hyperserotonemia; Hypertryptophanemia;